Simple Dockerfile and Makefile which activates a container as an ubuntu shell.
Fork this repository as your own and make new empty repository on your GitHub account, like ubuntu-shell-mirror.
Then following commands copies this repository to your new empty repository.
$ git clone git@github:[your account]/ubuntu-shell.git
$ cd ubuntu-shell
$ git push --mirror git@github.com:[your account]/ubuntu-shell-mirror.git
make build builds the image.
make shell enables you to login to the container, mounts ${PWD}/workspace as /workspace.
make clean is just an alias of docker container prune removes all stopped container.
make doomsday removes all images, be careful when you run this command.
This is free and unencumbered software released into the public domain.